CN112702041A - Signal port anti-interference circuit and electrical equipment - Google Patents
Signal port anti-interference circuit and electrical equipment Download PDFInfo
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- CN112702041A CN112702041A CN202011465953.7A CN202011465953A CN112702041A CN 112702041 A CN112702041 A CN 112702041A CN 202011465953 A CN202011465953 A CN 202011465953A CN 112702041 A CN112702041 A CN 112702041A
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Abstract
The application discloses signal port anti jamming circuit and electrical equipment, signal port anti jamming circuit includes: the signal processing circuit is connected with the input end of the signal port and the reference ground end, and is used for filtering, amplifying and outputting the signal accessed by the signal port; the control circuit is connected with the signal processing circuit and used for comparing the parameters of the filtered and amplified signals with a preset range and outputting driving signals according to a comparison result; and the grounding switching circuit is connected with the control circuit, the reference grounding end and a grounding terminal and is used for controlling the signal port to switch or not to switch the grounding state according to the driving signal. The signal port anti-interference circuit can judge whether the parameters of the received signals are abnormal or not, control the switching of the grounding modes when the parameters of the signals are abnormal, and can continue to switch the grounding modes when the parameters of the received signals are judged to be abnormal, and finally select the optimal grounding mode to ensure the reliability of the system.
Description
Technical Field
The application belongs to the technical field of electronics, especially relates to a signal port anti jamming circuit and electrical equipment.
Background
The signal ports (such as an analog quantity signal port and a 485 communication signal port) of the existing frequency converter product are easy to interfere under the condition of severe environment (such as strong and weak electric near field coupling and poor system grounding), and the system works abnormally. At present, manufacturers add RC (resistance-capacitance) filtering between a signal reference ground and a ground wire to process the signals, or process the signals by adopting a high-cost isolation scheme. The former has interference risk in the practical application of a transmission system, and the scheme is solidified, has strong dependence on the system and poor self-adaptive capability, and cannot meet different application environments; the latter solution is expensive and not suitable for marketing or market competitiveness.
Disclosure of Invention
The application aims to provide a signal port anti-interference circuit and electrical equipment, and aims to solve the problems that the traditional signal port anti-interference scheme has interference risks, scheme solidification, strong system dependence, high cost and the like.
A first aspect of an embodiment of the present application provides an anti-interference circuit for a signal port, including:
a ground circuit, one end of which is connected with the reference ground end of the signal port, the ground circuit being used for filtering;
the signal processing circuit is connected with the input end of the signal port and the reference ground end, and is used for filtering, amplifying and outputting the signal accessed by the signal port;
the control circuit is connected with the signal processing circuit and used for comparing the parameters of the filtered and amplified signals with a preset range and outputting driving signals according to a comparison result;
and the grounding switching circuit is connected with the control circuit, the reference grounding end, the other end of the grounding circuit and a terminal of a grounding ground and is used for controlling the signal port to switch or not to switch the grounding state according to the driving signal.
In one embodiment, the control circuit is specifically configured to compare the voltage value of the filtered and amplified signal with a first preset range;
if the voltage value of the signal is out of the first preset range, outputting a first driving signal for controlling the grounding switching circuit to switch the grounding state;
if the voltage value of the signal is within the first preset range, outputting a second driving signal for controlling the grounding switching circuit not to switch the grounding state; or comparing the voltage fluctuation value of the filtered and amplified signal with a second preset range, outputting a first driving signal for controlling the grounding switching circuit to switch the grounding state when the voltage fluctuation value of the signal is out of the second preset range, and outputting a second driving signal for controlling the grounding switching circuit not to switch the grounding state when the voltage fluctuation value of the signal is in the second preset range.
In one embodiment, the control circuit is specifically configured to further compare the voltage fluctuation value of the filtered and amplified signal with a second preset range, output a first driving signal for controlling the ground switching circuit to switch the ground state when the voltage fluctuation value of the signal is outside the second preset range, and output a second driving signal for controlling the ground switching circuit not to switch the ground state when the voltage fluctuation value of the signal is within the second preset range.
In one embodiment, the ground state includes the reference ground terminal floating to ground, the reference ground terminal being connected to the ground terminal, and the reference ground terminal being connected to the ground terminal through the ground circuit.
In one embodiment, the signal processing circuit comprises an interference removing module, a voltage stabilizing and filtering module, an amplifying module and an output module which are connected in sequence,
the interference removing module is connected with the signal port and used for removing interference on the signal; the voltage stabilizing and filtering module performs voltage stabilizing and filtering on the signal output by the interference removing module, the amplifying module amplifies the signal output by the voltage stabilizing and filtering module, and the output module performs voltage stabilizing and outputting on the signal output by the amplifying module.
In one embodiment, the interference elimination module includes a common mode inductor, a first filter capacitor disposed on an input side of the common mode inductor, and a second filter capacitor and a first voltage dividing resistor disposed on an output side of the common mode inductor.
In one embodiment, the voltage-stabilizing filtering module comprises a voltage-stabilizing device connected to the output end of the interference removing module, and a filtering device and a voltage dividing device which are connected to the output end of the interference removing module and are located behind the voltage-stabilizing device, wherein the filtering device and the voltage dividing device are connected in parallel.
In one embodiment, the amplification module includes an operational amplifier, and a feedback device connected between an inverting input and an output of the operational amplifier.
In one embodiment, the ground switching circuit includes an isolation drive module and a relay assembly;
the isolation driving module is connected with the control end of the control circuit and the coil of the relay assembly and used for receiving the driving signal and controlling the coil of the relay assembly to be respectively electrified or powered down according to the driving signal, the relay assembly is provided with a movable contact connected with the terminal connected with the ground, a first contact connected with the reference ground end, a second contact connected with the other end of the grounding circuit and a suspended third contact, and the movable contact is normally closed with one of the first contact, the second contact and the third contact.
In one embodiment, the isolation driving module comprises a photoelectric coupler and a switching tube, wherein an input end of the photoelectric coupler is connected with the control circuit, a control end of the switching tube is connected with an output end of the photoelectric coupler, a first conduction end of the switching tube is connected with a power supply through the coil, and a second conduction end of the switching tube is grounded.
A second aspect of the embodiments of the present application provides an electrical device, including a signal port having a ground reference terminal and a signal input terminal, the signal port being embedded in or external to the electrical device.
The signal port anti-jamming circuit can judge whether the parameters of the received signals are abnormal or not, controls the switching of the grounding modes when the parameters of the signals are abnormal, can continue to switch the grounding modes when the parameters of the received signals are judged to be still abnormal, and finally selects the optimal grounding mode to ensure the reliability of the system.
Drawings
Fig. 1 is a schematic structural diagram of an anti-interference circuit of a signal port according to an embodiment of the present disclosure;
FIG. 2 is an exemplary circuit schematic of the signal processing circuitry of the signal port immunity circuit shown in FIG. 1;
FIG. 3 is an exemplary circuit schematic of a ground switching circuit of the signal port immunity circuit shown in FIG. 1;
fig. 4 is an exemplary circuit schematic of the relay assembly of the ground switching circuit shown in fig. 3.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1, a signal port anti-interference circuit according to a preferred embodiment of the present invention includes a ground circuit 11, a signal processing circuit 12, a control circuit 13, and a ground switching circuit 14.
One end of the grounding circuit 11 is connected with the reference ground end of the signal port, and the grounding circuit 11 is used for filtering; the signal processing circuit 12 is connected with the input end of the signal port and the reference ground end, and outputs the signal accessed by the signal port after filtering and amplifying; the control circuit 13 is connected with the signal processing circuit 12 and is configured to compare the parameter of the filtered and amplified signal with a preset range and output a driving signal according to a comparison result; the ground switching circuit 14 is connected to the control circuit 13, the reference ground terminal, the other end of the ground circuit 11, and a terminal of the ground, and is configured to control the signal port to switch or not switch the ground state according to the driving signal.
Generally, the grounding circuit 11 may be an RC filter circuit, an electrostatic discharge circuit, or the like. The control circuit 13 is a chip having a general logic processing function, such as a single chip microcomputer or a Digital Signal Processing (DSP) chip. The parameters of the signal may be voltage parameters, current parameters, or power parameters, etc. The ground state includes the reference ground terminal 22 floating (i.e., not grounded), the reference ground terminal 22 being connected to the grounded terminal 24 (i.e., directly grounded), and the reference ground terminal 22 being connected to the grounded terminal 24 through the ground circuit 11 (i.e., grounded through the ground circuit 11).
In one embodiment, the control circuit 13 is specifically configured to compare the voltage value of the filtered and amplified signal with a preset range; for example, the preset range of the voltage value of the filtered and amplified signal is set to be 0-3V. If the voltage value of the signal is outside the preset range (for example, 3.1V), the ground state of the signal port is determined not to meet the system requirement, and a first driving signal for controlling the ground switching circuit 14 to switch the ground state is output. If the voltage value of the filtered and amplified signal is within the preset range (for example, 2V), a second driving signal for controlling the ground switching circuit 14 not to switch the ground state is output.
In one embodiment, if the voltage value of the filtered and amplified signal is within a preset range (e.g., 2V), the voltage fluctuation value of the filtered and amplified signal is further compared with a second preset range (e.g., 0 to 100mV), a first driving signal for controlling the ground switching circuit 14 to switch the ground state is output when the voltage fluctuation value of the filtered and amplified signal is outside the second preset range, and a second driving signal for controlling the ground switching circuit 14 not to switch the ground state is output when the voltage fluctuation value of the filtered and amplified signal is within the second preset range.
In another embodiment, the control circuit 13 does not compare the voltage value of the filtered and amplified signal with the preset range, but directly compares the voltage fluctuation value of the filtered and amplified signal with a second preset range (e.g. 0-100 mV), outputs a first driving signal for controlling the ground switching circuit 14 to switch the ground state when the voltage fluctuation value of the filtered and amplified signal is outside the second preset range, and outputs a second driving signal for controlling the ground switching circuit 14 not to switch the ground state when the voltage fluctuation value of the filtered and amplified signal is within the second preset range
It can be understood that the voltage fluctuation refers to that a voltage which meets a preset range is used as a reference to fluctuate up and down, for example, the voltage in the preset range is arbitrarily 2V between 0V and 3V, the preset value of the voltage fluctuation is 100mV, that is, the voltage of the filtered and amplified signal is normal voltage fluctuation smaller than the preset value between 1.95V and 2.05V, then the ground state of the signal port is considered to meet the system requirement, and at this time, the control circuit 13 outputs a second driving signal which controls the ground switching circuit 14 not to switch the ground state to the ground switching circuit 14 (for example, a low-level signal); if the voltage of the filtered and amplified signal is out of 1.95V to 2.05V, the ground state of the signal port is considered to be not in accordance with the system requirement, and at this time, the control circuit 13 outputs a first driving signal (such as a high level signal or a signal combining high and low levels) for controlling the ground switching circuit 14 to switch the ground state to the ground switching circuit 14.
Referring to fig. 2, in one embodiment, the signal processing circuit 12 includes an interference removing module 121, a voltage stabilizing and filtering module 122, an amplifying module 123 and an output module 124, which are connected in sequence.
The interference removing module 121 is connected to the signal port and configured to perform interference removing processing on the signal; the voltage stabilizing and filtering module 122 performs voltage stabilizing and filtering on the signal output by the interference removing module 121, the amplifying module 123 amplifies the signal output by the voltage stabilizing and filtering module 122, and the output module 124 performs voltage stabilizing and outputting on the signal output by the amplifying module 123.
In one embodiment, the interference elimination module 121 includes a common mode inductor L1, a first filter capacitor C1 disposed on an input side of the common mode inductor L1, and a second filter capacitor C2 and a first voltage dividing resistor R1 disposed on an output side of the common mode inductor L1. The first filtering capacitor C1/the second filtering capacitor C2 may be formed by a plurality of capacitors connected in series and in parallel, the first voltage dividing resistor R1 may also be formed by a plurality of resistors connected in series and in parallel, and the interference removing module 121 is mainly used for removing various interference signals, such as common mode interference current and the like.
In one embodiment, the voltage-stabilizing filter module 122 includes a voltage-stabilizing device D1 connected to the output terminal of the interference elimination module 121, and a filter device C3 and a voltage-dividing device R2 connected to the output terminal of the interference elimination module 121 and located after the voltage-stabilizing device D1, wherein the filter device C3 and the voltage-dividing device R2 are connected in parallel. The voltage regulator device D1 is generally a three-terminal regulator, and the output filter device C3 and the voltage divider device R2 are generally a filter capacitor and a resistor, respectively.
In one embodiment, the amplification module 123 includes an operational amplifier U1, and a feedback device R3 connected between the inverting input and output of the operational amplifier U1. The feedback device R3 generally includes a capacitive, resistive device. The output module 124 is also typically provided with a three-terminal regulator D2.
Referring to fig. 3, in one embodiment, the ground switching circuit 14 includes an isolation driving module 141 and a relay assembly 142.
The isolation driving module 141 is connected to the control terminal of the control circuit 13 and the coil 1421 of the relay assembly 142, and is configured to receive a driving signal and control the coil of the relay assembly 142 to be powered on or powered off according to the driving signal, where the relay assembly 142 has a movable contact connected to the terminal 24 connected to the ground, a first contact connected to the reference ground terminal 22, a second contact connected to the other end 23 of the ground circuit 11, and a floating third contact, and the movable contact is normally closed to one of the first contact, the second contact, and the third contact. In one embodiment, the relay assembly 142 includes two relays, wherein the coils 1421 of the two relays are respectively driven by two isolated driving modules 141, please refer to the embodiment of fig. 4, the number of floating third contacts is two, and both of them are normally closed to the two moving contacts, that is, the default grounding state is that the reference ground terminal 22 is floating, when the reference ground terminal 22 needs to be directly grounded, the control circuit 13 outputs a driving signal to drive the relay a connected to the reference ground terminal 22 to operate, and when the reference ground terminal 22 needs to be directly grounded through the grounding circuit 11, the control circuit 13 outputs a driving signal to drive the relay B connected to the other end 23 of the grounding circuit 11 to operate.
In one embodiment, the isolation driving module 141 includes a photocoupler U2 and a switching tube Q1, an input terminal of the photocoupler U2 is connected to the control circuit 13, a control terminal of the switching tube Q1 is connected to an output terminal of the photocoupler U2, a first conduction terminal of the switching tube Q1 is connected to the power supply through a coil of the relay assembly 142, and a second conduction terminal is grounded. Further, a schmitt buffer U3 for improving the driving capability of the driving signal and an indicator light D4 connected with the switching tube Q1 for indicating the action of the relay moving assembly are further arranged between the input end of the photocoupler U2 and the control circuit 13.
A second aspect of the embodiments of the present application provides an electrical device, including a signal port, where the signal port has a ground reference terminal and a signal input terminal, and the signal port is built in or external to the electrical device. The electrical device may be a frequency converter, a drive, etc.
In one example, the external given voltage signal (0-10V) is inputted to the P1 port of the signal processing circuit 12 through the signal processing circuit 12 in FIG. 2, and is converted into a voltage signal (0-3V) to P1-AD through the port filtering and operational amplifier circuit processing, that is, inputted to the DSP chip, when the signal received by the DSP chip is not abnormal (i.e. the voltage fluctuation thereof is not more than 100mV), the grounding switch circuit 14 does not operate, the current grounding mode is maintained, when the signal received by the DSP chip is abnormal (voltage fluctuation more than 100mV), the DSP chip outputs the driving signal to the input end _ DSP of the grounding switch circuit 14 through the internal signal processing (two groups of signals are respectively outputted to the two output isolation driving modules 141 to control the switching of three grounding states), and outputs high or low level to operate the relay A/B, thereby achieving the switching of the grounding state/mode. And if the signal received by the DSP chip is still abnormally fluctuated, the grounding mode is continuously switched, so that the DSP chip automatically selects the optimal grounding mode through internal comparison processing to ensure the reliability of the system.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A signal port immunity circuit, comprising:
a ground circuit, one end of which is connected with the reference ground end of the signal port, the ground circuit being used for filtering;
the signal processing circuit is connected with the input end of the signal port and the reference ground end, and is used for filtering, amplifying and outputting the signal accessed by the signal port;
the control circuit is connected with the signal processing circuit and used for comparing the parameters of the filtered and amplified signals with a preset range and outputting driving signals according to a comparison result;
and the grounding switching circuit is connected with the control circuit, the reference grounding end, the other end of the grounding circuit and a terminal of a grounding ground and is used for controlling the signal port to switch or not to switch the grounding state according to the driving signal.
2. The signal port immunity circuit of claim 1, wherein said control circuit is specifically configured to compare a voltage value of said filtered and amplified signal to a first predetermined range;
if the voltage value of the signal is out of the first preset range, outputting a first driving signal for controlling the grounding switching circuit to switch the grounding state; if the voltage value of the signal is within the first preset range, outputting a second driving signal for controlling the grounding switching circuit not to switch the grounding state; or comparing the voltage fluctuation value of the filtered and amplified signal with a second preset range, outputting a first driving signal for controlling the grounding switching circuit to switch the grounding state when the voltage fluctuation value of the signal is out of the second preset range, and outputting a second driving signal for controlling the grounding switching circuit not to switch the grounding state when the voltage fluctuation value of the signal is in the second preset range.
3. The signal port immunity circuit as claimed in claim 1, wherein the control circuit is specifically configured to further compare the voltage fluctuation value of the filtered and amplified signal with a second preset range, and output a first driving signal for controlling the ground switching circuit to switch the ground state when the voltage fluctuation value of the signal is outside the second preset range, and output a second driving signal for controlling the ground switching circuit not to switch the ground state when the voltage fluctuation value of the signal is within the second preset range.
4. The signal port immunity circuit of claim 1 wherein said ground state includes said reference ground terminal floating, said reference ground terminal being connected to a terminal of said ground through said ground circuit.
5. The signal port immunity circuit of claim 1, wherein said signal processing circuit includes an interference elimination module, a voltage stabilization filtering module, an amplification module and an output module connected in sequence,
the interference removing module is connected with the signal port and used for removing interference on the signal; the voltage stabilizing and filtering module performs voltage stabilizing and filtering on the signal output by the interference removing module, the amplifying module amplifies the signal output by the voltage stabilizing and filtering module, and the output module performs voltage stabilizing and outputting on the signal output by the amplifying module.
6. The signal port immunity circuit of claim 5, wherein:
the interference elimination module comprises a common-mode inductor, a first filter capacitor arranged on the input side of the common-mode inductor, a second filter capacitor and a first divider resistor arranged on the output side of the common-mode inductor;
the voltage stabilizing and filtering module comprises a voltage stabilizing device connected to the output end of the interference removing module, a filter device and a voltage dividing device, wherein the filter device and the voltage dividing device are connected to the output end of the interference removing module and are positioned behind the voltage stabilizing device, and the filter device and the voltage dividing device are connected in parallel.
7. The signal port immunity circuit of claim 6, wherein said amplification module includes an operational amplifier, and a feedback device connected between an inverting input and an output of said operational amplifier.
8. The signal port immunity circuit of any of claims 1 through 7, wherein said ground switching circuit includes an isolation drive module and a relay assembly;
the isolation driving module is connected with the control end of the control circuit and the coil of the relay assembly and used for receiving the driving signal and controlling the coil of the relay assembly to be respectively electrified or powered down according to the driving signal, the relay assembly is provided with a movable contact connected with the terminal connected with the ground, a first contact connected with the reference ground end, a second contact connected with the other end of the grounding circuit and a suspended third contact, and the movable contact is normally closed with one of the first contact, the second contact and the third contact.
9. The signal port anti-interference circuit according to claim 8, wherein the isolation driving module comprises an opto-coupler and a switching tube, an input end of the opto-coupler is connected to the control circuit, a control end of the switching tube is connected to an output end of the opto-coupler, a first conduction end of the switching tube is connected to the power supply through the coil, and a second conduction end of the switching tube is grounded.
10. An electrical device comprising a signal port having a reference ground terminal and a signal input terminal, wherein the signal port tamper resistant circuitry of any one of claims 1 to 9 is built into or external to the electrical device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011465953.7A CN112702041B (en) | 2020-12-14 | 2020-12-14 | Signal port anti-interference circuit and electrical equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011465953.7A CN112702041B (en) | 2020-12-14 | 2020-12-14 | Signal port anti-interference circuit and electrical equipment |
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| CN112702041A true CN112702041A (en) | 2021-04-23 |
| CN112702041B CN112702041B (en) | 2023-08-25 |
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| CN101930031A (en) * | 2009-06-24 | 2010-12-29 | 罗望保 | Multi-point simultaneous-measurement digital grounding resistance tester |
| CN104079151A (en) * | 2014-07-22 | 2014-10-01 | 诸暨市沃思环保技术有限公司 | Anti-jamming circuit for ventilator room power supply system driver module of buried sewage disposal device |
| CN205643734U (en) * | 2016-05-26 | 2016-10-12 | 湖南科技大学 | Electrical prospecting electrode converting circuit |
| CN110442270A (en) * | 2019-08-29 | 2019-11-12 | 深圳市德名利电子有限公司 | The method, apparatus and touch panel of touch screen antidisturbance control |
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2020
- 2020-12-14 CN CN202011465953.7A patent/CN112702041B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101930031A (en) * | 2009-06-24 | 2010-12-29 | 罗望保 | Multi-point simultaneous-measurement digital grounding resistance tester |
| CN104079151A (en) * | 2014-07-22 | 2014-10-01 | 诸暨市沃思环保技术有限公司 | Anti-jamming circuit for ventilator room power supply system driver module of buried sewage disposal device |
| CN205643734U (en) * | 2016-05-26 | 2016-10-12 | 湖南科技大学 | Electrical prospecting electrode converting circuit |
| CN110442270A (en) * | 2019-08-29 | 2019-11-12 | 深圳市德名利电子有限公司 | The method, apparatus and touch panel of touch screen antidisturbance control |
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| CN112702041B (en) | 2023-08-25 |
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